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rockbox/bootloader/main-pp.c
Barry Wardell 54c73a24b6 Bring back rolo for mi4-based targets (H10 and Sansa). 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13550 a1c6a512-1295-4272-9138-f99709370657
2007-06-04 13:48:21 +00:00

606 lines
17 KiB
C
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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2006 by Barry Wardell
*
* Based on Rockbox iriver bootloader by Linus Nielsen Feltzing
* and the ipodlinux bootloader by Daniel Palffy and Bernard Leach
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include "common.h"
#include "cpu.h"
#include "file.h"
#include "system.h"
#include "kernel.h"
#include "lcd.h"
#include "font.h"
#include "ata.h"
#include "button.h"
#include "disk.h"
#include "crc32-mi4.h"
#include <string.h>
#ifdef SANSA_E200
#include "usb.h"
#endif
/* Button definitions */
#if CONFIG_KEYPAD == IRIVER_H10_PAD
#define BOOTLOADER_BOOT_OF BUTTON_LEFT
#elif CONFIG_KEYPAD == SANSA_E200_PAD
#define BOOTLOADER_BOOT_OF BUTTON_LEFT
#endif
/* Maximum allowed firmware image size. 10MB is more than enough */
#define MAX_LOADSIZE (10*1024*1024)
/* A buffer to load the original firmware or Rockbox into */
unsigned char *loadbuffer = (unsigned char *)DRAM_START;
/* Bootloader version */
char version[] = APPSVERSION;
/* Locations and sizes in hidden partition on Sansa */
#ifdef SANSA_E200
#define PPMI_SECTOR_OFFSET 1024
#define PPMI_SECTORS 1
#define MI4_HEADER_SECTORS 1
#define NUM_PARTITIONS 2
#else
#define NUM_PARTITIONS 1
#endif
#define MI4_HEADER_SIZE 0x200
/* mi4 header structure */
struct mi4header_t {
unsigned char magic[4];
uint32_t version;
uint32_t length;
uint32_t crc32;
uint32_t enctype;
uint32_t mi4size;
uint32_t plaintext;
uint32_t dsa_key[10];
uint32_t pad[109];
unsigned char type[4];
unsigned char model[4];
};
/* PPMI header structure */
struct ppmi_header_t {
unsigned char magic[4];
uint32_t length;
uint32_t pad[126];
};
inline unsigned int le2int(unsigned char* buf)
{
int32_t res = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
return res;
}
inline void int2le(unsigned int val, unsigned char* addr)
{
addr[0] = val & 0xFF;
addr[1] = (val >> 8) & 0xff;
addr[2] = (val >> 16) & 0xff;
addr[3] = (val >> 24) & 0xff;
}
struct tea_key {
const char * name;
uint32_t key[4];
};
#define NUM_KEYS 11
struct tea_key tea_keytable[] = {
{ "default" , { 0x20d36cc0, 0x10e8c07d, 0xc0e7dcaa, 0x107eb080 } },
{ "sansa", { 0xe494e96e, 0x3ee32966, 0x6f48512b, 0xa93fbb42 } },
{ "sansa_gh", { 0xd7b10538, 0xc662945b, 0x1b3fce68, 0xf389c0e6 } },
{ "rhapsody", { 0x7aa9c8dc, 0xbed0a82a, 0x16204cc7, 0x5904ef38 } },
{ "p610", { 0x950e83dc, 0xec4907f9, 0x023734b9, 0x10cfb7c7 } },
{ "p640", { 0x220c5f23, 0xd04df68e, 0x431b5e25, 0x4dcc1fa1 } },
{ "virgin", { 0xe83c29a1, 0x04862973, 0xa9b3f0d4, 0x38be2a9c } },
{ "20gc_eng", { 0x0240772c, 0x6f3329b5, 0x3ec9a6c5, 0xb0c9e493 } },
{ "20gc_fre", { 0xbede8817, 0xb23bfe4f, 0x80aa682d, 0xd13f598c } },
{ "elio_p722", { 0x6af3b9f8, 0x777483f5, 0xae8181cc, 0xfa6d8a84 } },
{ "c200", { 0xbf2d06fa, 0xf0e23d59, 0x29738132, 0xe2d04ca7 } },
};
/*
tea_decrypt() from http://en.wikipedia.org/wiki/Tiny_Encryption_Algorithm
"Following is an adaptation of the reference encryption and decryption
routines in C, released into the public domain by David Wheeler and
Roger Needham:"
*/
/* NOTE: The mi4 version of TEA uses a different initial value to sum compared
to the reference implementation and the main loop is 8 iterations, not
32.
*/
static void tea_decrypt(uint32_t* v0, uint32_t* v1, uint32_t* k) {
uint32_t sum=0xF1BBCDC8, i; /* set up */
uint32_t delta=0x9E3779B9; /* a key schedule constant */
uint32_t k0=k[0], k1=k[1], k2=k[2], k3=k[3]; /* cache key */
for(i=0; i<8; i++) { /* basic cycle start */
*v1 -= ((*v0<<4) + k2) ^ (*v0 + sum) ^ ((*v0>>5) + k3);
*v0 -= ((*v1<<4) + k0) ^ (*v1 + sum) ^ ((*v1>>5) + k1);
sum -= delta; /* end cycle */
}
}
/* mi4 files are encrypted in 64-bit blocks (two little-endian 32-bit
integers) and the key is incremented after each block
*/
static void tea_decrypt_buf(unsigned char* src, unsigned char* dest, size_t n, uint32_t * key)
{
uint32_t v0, v1;
unsigned int i;
for (i = 0; i < (n / 8); i++) {
v0 = le2int(src);
v1 = le2int(src+4);
tea_decrypt(&v0, &v1, key);
int2le(v0, dest);
int2le(v1, dest+4);
src += 8;
dest += 8;
/* Now increment the key */
key[0]++;
if (key[0]==0) {
key[1]++;
if (key[1]==0) {
key[2]++;
if (key[2]==0) {
key[3]++;
}
}
}
}
}
static inline bool tea_test_key(unsigned char magic_enc[8], uint32_t * key, int unaligned)
{
unsigned char magic_dec[8];
tea_decrypt_buf(magic_enc, magic_dec, 8, key);
return (le2int(&magic_dec[4*unaligned]) == 0xaa55aa55);
}
static int tea_find_key(struct mi4header_t *mi4header, int fd)
{
int i, rc;
unsigned int j;
uint32_t key[4];
unsigned char magic_enc[8];
int key_found = -1;
unsigned int magic_location = mi4header->length-4;
int unaligned = 0;
if ( (magic_location % 8) != 0 )
{
unaligned = 1;
magic_location -= 4;
}
/* Load encrypted magic 0xaa55aa55 to check key */
lseek(fd, MI4_HEADER_SIZE + magic_location, SEEK_SET);
rc = read(fd, magic_enc, 8);
if(rc < 8 )
return EREAD_IMAGE_FAILED;
printf("Searching for key:");
for (i=0; i < NUM_KEYS && (key_found<0) ; i++) {
key[0] = tea_keytable[i].key[0];
key[1] = tea_keytable[i].key[1];
key[2] = tea_keytable[i].key[2];
key[3] = tea_keytable[i].key[3];
/* Now increment the key */
for(j=0; j<((magic_location-mi4header->plaintext)/8); j++){
key[0]++;
if (key[0]==0) {
key[1]++;
if (key[1]==0) {
key[2]++;
if (key[2]==0) {
key[3]++;
}
}
}
}
if (tea_test_key(magic_enc,key,unaligned))
{
key_found = i;
printf("%s...found", tea_keytable[i].name);
} else {
/* printf("%s...failed", tea_keytable[i].name); */
}
}
return key_found;
}
/* Load mi4 format firmware image */
int load_mi4(unsigned char* buf, char* firmware, unsigned int buffer_size)
{
int fd;
struct mi4header_t mi4header;
int rc;
unsigned long sum;
char filename[MAX_PATH];
snprintf(filename,sizeof(filename),"/.rockbox/%s",firmware);
fd = open(filename, O_RDONLY);
if(fd < 0)
{
snprintf(filename,sizeof(filename),"/%s",firmware);
fd = open(filename, O_RDONLY);
if(fd < 0)
return EFILE_NOT_FOUND;
}
read(fd, &mi4header, MI4_HEADER_SIZE);
/* MI4 file size */
printf("mi4 size: %x", mi4header.mi4size);
if ((mi4header.mi4size-MI4_HEADER_SIZE) > buffer_size)
return EFILE_TOO_BIG;
/* CRC32 */
printf("CRC32: %x", mi4header.crc32);
/* Rockbox model id */
printf("Model id: %.4s", mi4header.model);
/* Read binary type (RBOS, RBBL) */
printf("Binary type: %.4s", mi4header.type);
/* Load firmware file */
lseek(fd, MI4_HEADER_SIZE, SEEK_SET);
rc = read(fd, buf, mi4header.mi4size-MI4_HEADER_SIZE);
if(rc < (int)mi4header.mi4size-MI4_HEADER_SIZE)
return EREAD_IMAGE_FAILED;
/* Check CRC32 to see if we have a valid file */
sum = chksum_crc32 (buf, mi4header.mi4size - MI4_HEADER_SIZE);
printf("Calculated CRC32: %x", sum);
if(sum != mi4header.crc32)
return EBAD_CHKSUM;
if( (mi4header.plaintext + MI4_HEADER_SIZE) != mi4header.mi4size)
{
/* Load encrypted firmware */
int key_index = tea_find_key(&mi4header, fd);
if (key_index < 0)
return EINVALID_FORMAT;
/* Plaintext part is already loaded */
buf += mi4header.plaintext;
/* Decrypt in-place */
tea_decrypt_buf(buf, buf,
mi4header.mi4size-(mi4header.plaintext+MI4_HEADER_SIZE),
tea_keytable[key_index].key);
printf("%s key used", tea_keytable[key_index].name);
/* Check decryption was successfull */
if(le2int(&buf[mi4header.length-mi4header.plaintext-4]) != 0xaa55aa55)
{
return EREAD_IMAGE_FAILED;
}
}
return EOK;
}
#ifdef SANSA_E200
struct OFDB_info {
char *version;
int version_length;
int sector;
int offset;
} OFDatabaseOffsets[] = {
{ "PP5022AF-05.51-S301-01.11-S301.01.11A-D", 39, 0x3c08, 0xe1 },
{ "PP5022AF-05.51-S301-00.12-S301.00.12E-D", 39, 0x3c5c, 0x2 },
{ "PP5022AF-05.51-S301-00.12-S301.00.12A-D", 39, 0x3c08, 0xe1 },
};
/* Load mi4 firmware from a hidden disk partition */
int load_mi4_part(unsigned char* buf, struct partinfo* pinfo,
unsigned int buffer_size, bool disable_rebuild)
{
struct mi4header_t mi4header;
struct ppmi_header_t ppmi_header;
unsigned long sum;
/* Read header to find out how long the mi4 file is. */
ata_read_sectors(pinfo->start + PPMI_SECTOR_OFFSET,
PPMI_SECTORS, &ppmi_header);
/* The first four characters at 0x80000 (sector 1024) should be PPMI*/
if( memcmp(ppmi_header.magic, "PPMI", 4) )
return EFILE_NOT_FOUND;
printf("BL mi4 size: %x", ppmi_header.length);
/* Read mi4 header of the OF */
ata_read_sectors(pinfo->start + PPMI_SECTOR_OFFSET + PPMI_SECTORS
+ (ppmi_header.length/512), MI4_HEADER_SECTORS, &mi4header);
/* We don't support encrypted mi4 files yet */
if( (mi4header.plaintext) != (mi4header.mi4size-MI4_HEADER_SIZE))
return EINVALID_FORMAT;
/* MI4 file size */
printf("OF mi4 size: %x", mi4header.mi4size);
if ((mi4header.mi4size-MI4_HEADER_SIZE) > buffer_size)
return EFILE_TOO_BIG;
/* CRC32 */
printf("CRC32: %x", mi4header.crc32);
/* Rockbox model id */
printf("Model id: %.4s", mi4header.model);
/* Read binary type (RBOS, RBBL) */
printf("Binary type: %.4s", mi4header.type);
/* Load firmware */
ata_read_sectors(pinfo->start + PPMI_SECTOR_OFFSET + PPMI_SECTORS
+ (ppmi_header.length/512) + MI4_HEADER_SECTORS,
(mi4header.mi4size-MI4_HEADER_SIZE)/512, buf);
/* Check CRC32 to see if we have a valid file */
sum = chksum_crc32 (buf,mi4header.mi4size-MI4_HEADER_SIZE);
printf("Calculated CRC32: %x", sum);
if(sum != mi4header.crc32)
return EBAD_CHKSUM;
if (disable_rebuild)
{
char block[512];
int sector = 0, offset = 0;
unsigned int i;
/* check which known version we have */
/* These are taken from the PPPS section, 0x00780240 */
ata_read_sectors(pinfo->start + 0x3C01, 1, block);
for (i=0; i<sizeof(OFDatabaseOffsets)/sizeof(*OFDatabaseOffsets); i++)
{
if (!memcmp(&block[0x40], OFDatabaseOffsets[i].version,
OFDatabaseOffsets[i].version_length))
{
sector = pinfo->start + OFDatabaseOffsets[i].sector;
offset = OFDatabaseOffsets[i].offset;
break;
}
}
if (sector && offset)
{
ata_read_sectors(sector, 1, block);
block[offset] = 0;
ata_write_sectors(sector, 1, block);
}
}
return EOK;
}
#endif
void* main(void)
{
char buf[256];
int i;
int btn;
int rc;
int num_partitions;
unsigned short* identify_info;
struct partinfo* pinfo;
#ifdef SANSA_E200
int usb_retry = 0;
bool usb = false;
#endif
chksum_crc32gentab ();
system_init();
kernel_init();
lcd_init();
font_init();
button_init();
lcd_set_foreground(LCD_WHITE);
lcd_set_background(LCD_BLACK);
lcd_clear_display();
btn = button_read_device();
#ifdef SANSA_E200
usb_init();
while (usb_retry < 5 && !usb)
{
usb_retry++;
sleep(HZ/4);
usb = usb_detect();
}
if (usb)
btn |= BOOTLOADER_BOOT_OF;
#endif
/* Enable bootloader messages if any button is pressed */
if (btn)
verbose = true;
lcd_setfont(FONT_SYSFIXED);
printf("Rockbox boot loader");
printf("Version: %s", version);
printf(MODEL_NAME);
i=ata_init();
if (i==0) {
identify_info=ata_get_identify();
/* Show model */
for (i=0; i < 20; i++) {
((unsigned short*)buf)[i]=htobe16(identify_info[i+27]);
}
buf[40]=0;
for (i=39; i && buf[i]==' '; i--) {
buf[i]=0;
}
printf(buf);
} else {
error(EATA, i);
}
disk_init();
num_partitions = disk_mount_all();
if (num_partitions<=0)
{
error(EDISK,num_partitions);
}
/* Just list the first 2 partitions since we don't have any devices yet
that have more than that */
for(i=0; i<NUM_PARTITIONS; i++)
{
pinfo = disk_partinfo(i);
printf("Partition %d: 0x%02x %ld MB",
i, pinfo->type, pinfo->size / 2048);
}
if(btn & BOOTLOADER_BOOT_OF)
{
/* Load original mi4 firmware in to a memory buffer called loadbuffer.
The rest of the loading is done in crt0.S.
1) First try reading from the hidden partition (on Sansa only).
2) Next try a decrypted mi4 file in /System/OF.mi4
3) Finally, try a raw firmware binary in /System/OF.mi4. It should be
a mi4 firmware decrypted and header stripped using mi4code.
*/
printf("Loading original firmware...");
#ifdef SANSA_E200
/* First try a (hidden) firmware partition */
printf("Trying firmware partition");
pinfo = disk_partinfo(1);
if(pinfo->type == PARTITION_TYPE_OS2_HIDDEN_C_DRIVE)
{
rc = load_mi4_part(loadbuffer, pinfo, MAX_LOADSIZE, usb);
if (rc < EOK) {
printf("Can't load from partition");
printf(strerror(rc));
} else {
return (void*)loadbuffer;
}
} else {
printf("No hidden partition found.");
}
#endif
printf("Trying /System/OF.mi4");
rc=load_mi4(loadbuffer, "/System/OF.mi4", MAX_LOADSIZE);
if (rc < EOK) {
printf("Can't load /System/OF.mi4");
printf(strerror(rc));
} else {
return (void*)loadbuffer;
}
printf("Trying /System/OF.bin");
rc=load_raw_firmware(loadbuffer, "/System/OF.bin", MAX_LOADSIZE);
if (rc < EOK) {
printf("Can't load /System/OF.bin");
printf(strerror(rc));
} else {
return (void*)loadbuffer;
}
error(0, 0);
} else {
#if 0 /* e200: enable to be able to dump the hidden partition */
if(btn & BUTTON_UP)
{
int fd;
pinfo = disk_partinfo(1);
fd = open("/part.bin", O_CREAT|O_RDWR);
char sector[512];
for(i=0; i<40960; i++){
if (!(i%100))
{
printf("dumping sector %d", i);
}
ata_read_sectors(pinfo->start + i,1 , sector);
write(fd,sector,512);
}
close(fd);
}
#endif
printf("Loading Rockbox...");
rc=load_mi4(loadbuffer, BOOTFILE, MAX_LOADSIZE);
if (rc < EOK) {
printf("Can't load %s:", BOOTFILE);
printf(strerror(rc));
/* Try loading rockbox from old rockbox.e200/rockbox.h10 format */
rc=load_firmware(loadbuffer, OLD_BOOTFILE, MAX_LOADSIZE);
if (rc < EOK) {
printf("Can't load %s:", OLD_BOOTFILE);
error(EBOOTFILE, rc);
}
}
}
return (void*)loadbuffer;
}
#ifndef SANSA_E200
/* These functions are present in the firmware library, but we reimplement
them here because the originals do a lot more than we want */
void usb_acknowledge(void)
{
}
void usb_wait_for_disconnect(void)
{
}
#endif
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